Replace 7 hand-rolled service files (mcp_bridge, webview_svc, brain_mcp,
claude_bridge, headless_mcp, headless, greetservice) with ecosystem
packages from core/gui, core/mcp, and core/go-ws.
Three operating modes: GUI (Wails systray), MCP (--mcp stdio for Claude
Code), and headless (no display). Core framework manages all service
lifecycles via dependency injection.
Co-Authored-By: Virgil <virgil@lethean.io>